Connector for concrete pipes

ABSTRACT

This invention relates to a connecting pipe for a liquid-tight connection to a sewer pipe. The connecting pipe comprises a connecting-pipe body having at least two spaced apart circumferential sealing chambers, where one of the sealing chambers contains a first sealing element comprising a ring seal proximate an inside surface of the sewer pipe and facing an opening-wall surface of the branch opening. The ring seal comprises at least one sealing-lip ring extending over an outer contour of this sealing chamber to contact the opening-wall surface of the branch opening. Another sealing chamber contains a second sealing element comprising a flexible filler proximate an outer surface of the sewer pipe and facing the opening-wall surface of the branch opening, such that a slot chamber extending from this sealing chamber to the opening-wall surface of the branch opening is sealingly bridged. The connecting pipe comprises a spacing ring having a bearing flange compatible with an outside pipe surface of the sewer pipe, wherein the spacing ring is a positioning ring fastened to the connecting-pipe body by fastening means in such a manner that when the connecting-pipe body is inserted into the branch opening, the first and second sealing elements are positioned opposite the opening-wall surface of the branch opening.

This application is the national phase of international applicationPCT/EP97/01232, filed Mar. 11, 1997 which designated the U.S.

The invention relates to a connecting pipe for a liquid-tight connectionto a sewer pipe in whose wall a branch opening is placed, which pipecomprises:

A connecting-pipe body in which are least two circumferential sealingchambers are arranged which are spaced from one another and into which asealing element can be placed, and

A spacing ring whose bearing flange is compatible with the outer pipesurface of the sewer pipe.

DE-U-29 601 453 teaches a connecting pipe for a feed pipe. Theconnecting pipe comprises an insertion part provided withcircumferential rubber seals. After the placing of a branch opening inthe sewer pipe the insertion part is inserted into the branch opening.The ends of the rubber seals which ends press on the inner wall of thesewer pipe consisting of concrete then assume the sealing function.

It is disadvantageous that a sealing and holding behavior of theconnecting pipe in the branch opening is a function of the materialelasticity of the rubber seals. The extreme roughness of the concretecan reduce the seal. Gases developing in the sewer pipe can expel theinsertion part like a cork out of a champagne bottle.

A connection of a connecting pipe to a sewer pipe is known from DE-U-29514 881. A circumferential sealing chamber is arranged at the end of theconnecting pipe into which chamber a ring seal is placed. The ring sealhas a sealing lip extending over the sealing chamber. The connectingpipe is then completely thrust through a branch opening placed in thesewer pipe with the seal designed in this manner in front. Thetight-closing connection is established by raising up the connectingpipe. A tension ring under which a position ring is placed assures atightening of the sealing ring. A groove placed in the connecting pipeinto which groove a web of the positioning ring engages assures that thepositioning ring rests in the proper position on the surface of thesewer pipe.

A connection of a connecting pipe to a sewer pipe is known from DE-A-3446 360. An opening is placed in the sewer pipe. In order to assure theconnection between the sewer pipe and the connecting pipe the connectingpipe comprises an insertion piece whose e nd intended to be insertedinto the opening has the form of an outwardly directed collar with anoutside diameter essentially equal to the diameter of the opening. Theother end, intended to receive the branch line, has an externalthreading. The connecting pipe is provided with an insertion piece whoseoutside diameter is less than the outside diameter of the collar and ofthe end provided with the threading. In addition, the connecting pipecomprises a tension ring. An L-shaped sealing ring is placed into adeveloping sealing chamber which sealing ring is then tightened with thetension ring. A disadvantage is the fact that the sealing connection canonly be produced by a tightening of the individual parts of the outertube. The sealing ring rests hereby on the outer surface of the sewerpipe and extends into the inside of the opening.

AT-C 332 815 teaches a sealing ring for a connection between conduitshafts and pipes vertical to the latter.

A disadvantage is the fact that the sealing ring rust correspond to thedimensions of the opening of the conduit shaft since it rests on theouter and the inner surface of the sewer pipe while jacketing theopening at the same time. As a result of this special shape the sealingring must assume the function of the inflow pipe at the same time.

EP-A-0 603 775 teaches a method of tightly connecting a sewer pipe to aconnecting pipe and teaches a connecting pipe which can be tightened tothis end. The connecting pipe comprises a sealing holding chamber on oneend into which chamber a ring seal is placed. A branch opening is placedin the sewer pipe into which opening the connecting pipe is insertedwith the sealing chamber in front until a turned-in sealing lip isfreed. The connecting pipe is sealingly held in the branch opening by araising up and subsequent tightening with a tension ring. Elevations ofpressure which occur in the interior of the sewer pipe are not able topress the connecting pipe tightened in this manner out of the conduitopening. In addition, plastic foam is introduced via an introduction,guidance and distribution system which foam fills up a space formed bythe connecting pipe and the opening and farms a foam-sealing and holdingelement. This element protects only the inner wall of the opening andthe reinforcement exposed in it and seals the connecting pipe from theoutside and only additionally holds it fixed in the opening.

EP-A-0 479 172 teaches an insertion sleeve; connection comprising asleeve, a pointed end of a pipe as insertion part and an activatablesealing ring of an elastomeric material. The sealing ring arranged inthe groove of the pointed end is activated in such a manner by forcingin air or a plastic or permanently elastic medium that it bridges aresidual slot between the sleeve and the pointed end and thus seals. Alip-shaped pre-sealing ring is located in front of the sealing ringwhich pre-sealing ring receives shearing forces which can result in anoverloading of the seal.

This solution can only be used for an insertion sleeve connection at avery high price. Thus, the sealing ring must have a base partcorresponding to the groove width, have two side flanks touching thegroove surfaces and have a deformable front part, which front part mustbe designed in such a manner in the non-activated state that the twocurved edge parts are at the same height as the pointed end surfacewhereas the curved inner part is located inside the groove.

The invention has the problem, starting from a connecting pipe of theknown type initially cited, of improving the insertion into andespecially the holding fast of the connecting pipe in the branch openingof the sewer pipe.

This problem is solved in accordance with the invention by the featuresof claim 1.

The advantages achieved are in particular that the connecting pipe canbe inserted like a cork into the prepared branch opening of the sewerpipe. The positioning ring fixed to the connecting pipe, the bearingflange of which ring is compatible with the outer pipe surface of thesewer pipe, assures that the body of the connecting pipe is set on inthe proper position. As a result thereof the circumferential sealing-lipring of the ring seal, which lies in the sealing chamber following thecurvature of the wall of the sewer pipe, comes to lie with the properfit and in the proper position opposite the inner surface of the branchopening. The beveled sealing-lip ring facilitates the insertion into thebranch opening. Once the connecting pipe has been thrust into the branchopening the sealing-lip ring offers a first active resistance to awithdrawal. In addition, its elasticity assures that it rests in aliquid-tight manner. Moreover, the penetration of the filler isfacilitated.

The flexible filler is then used. This filler does not have to bepre-formed extra. Rather, the sealing chamber needs only to be filledwith a filler material in such a manner after the insertion of theconnecting pipe that the slot chamber between the connecting pipe andthe wall of the branch opening is bridged. It is in particular possibleby varying the filling pressure to close extant hollow air spaces in theconcrete in a sealing manner.

The body of the connecting pipe can comprise several circumferentialsealing chambers spaced from each other. The flexible filler can befilled into at least the uppermost sealing chamber and a ring seal withat least one sealing-lip ring extending over the sealing chamber can beinserted into the lowest sealing chamber.

A flexible two-component polyurethane resin which thickens immediatelyand which is free of external softeners and other volatile compounds canbe used as filler. This composition assures that such a filler impartsthe same elasticity properties as air to the seal but not itsvolatility. As a result of the fact that the filler fills the slotchamber in a fixed amount any material expansions of the concrete andalso of the material of the connecting pipe used which occur can becompensated without adversely affecting the sealing behavior.

The ring seal can consist of a sealing body on which the sealing-lipring has been formed. One or two sealing-lip rings can be arranged onthe ring seal. If two sealing-lip rings are formed on, a circumferentialrecess which is partially circular in cross section can be placed in thesealing body between them. This special fashioning brings it about thatthe sealing ring exhibits a soft insertion procedure and elevatedproperties of sealing and of clinging fast.

The sealing chambers can be placed around the connecting pipe in acontour which corresponds to the following formula of development:##EQU1## and or

    y=π·d

with

α from 0 to 360° circumferential angle

D inside diameter of a sewer pipe

d inside diameter of a connecting pipe.

The simplest contour represents a circumferential circle around theconnecting pipe. Such a contour can be used when the sewer pipe has arelatively large thickness.

The meandering contour according to formula ##EQU2## is more favorablethan the simple circular contour. The advantage of this contour is basedon the fact that a projecting of the connecting pipe into the innerspace of the sewer pipe is avoided.

The wall curvature is thus ultimately determined by the shaping of theparticular sewer pipe. If a sewer pipe with a round cross section isused, the wall curvature corresponds to the pipe diameter of the sewerpipe. The wall curvature can be selected in such a manner thereby thatit can be used for sewer pipes with different pipe diameters. Thus, thewall curvature for a pipe with a diameter of 50 cm can be selected insuch a manner that pipes with a nominal diameter of 40 to 60 cm can alsobe encompassed at the same time.

In order to be able to connect a branch pipe to a connecting pipe in atightly sealing manner an annular connecting ring chamber is placed onthe inner surface of the body of the connecting pipe into which annularchamber a connecting ring seal is placed.

In addition, a limiting web which is at least partially circumferentialcan be arranged on the inner surface of the body of the connecting pipe.The limiting web constitutes an assembly aid for the branch pipe.

The body of the connecting pipe can merge on one end into an at leastpartially circumferential outer ring under which the positioning ring isarranged. The outer ring constitutes, with a longitudinally running webon the body of the connecting pipe on which a guide recess of thepositioning ring runs, the fixing elements for fixing and positioningthe positioning ring and the body of the connecting pipe relative toeach other.

It is advantageous if such a body of a connecting pipe is manufacturedin one piece with the circumferential outer ring from plastic,especially from polyvinyl chloride (PVC). Other plastics, e.g. PE, canalso be used. The positioning ring can also be manufactured fromplastic; however, a metal, especially a surface-finished metal, can alsobe used. Moreover, the positioning ring can also be manufactured fromconcrete. These materials are especially well suited for the particulardesign associated with the function of this part to be realized.

The connecting body can be designed as a connecting-pipe solid body oras a double-walled body. The case of a connecting-pipe solid bodyconcerns a pipe with a wall thickness of approximately 10 to 40 mm,preferably 20 mm.

The formation of the body of the connecting pipe as a connecting-pipesolid body has the advantage that the sealing chambers can be placed astwo circumferential seal-receiving grooves which are spaced relative toone another and which follow the wall curvature. The connecting ringchamber can then be formed on the inner side as an annular connectingring groove.

On the other hand, the ring seals and the connecting ring seal consistof a soft, elastic material. Rubber is used with advantage in thisinstance; however, plastic with an appropriate softness and hardness canalso be used.

An exemplary embodiment of the invention is shown in the drawings anddescribed in detail in the following.

FIG. 1 shows a sealing connection using two-component polyurethane resinas sealing element between a sewer pipe and a connecting pipe in aperspective view in partial section.

FIG. 2 shows a section through a connection according to FIG. 1 alongline II--II.

FIG. 3 shows a connecting pipe for a connection according to FIGS. 1 and2 in a schematic sectional view.

FIG. 4 shows another embodiment of a ring seal for a connecting pipeaccording to FIG. 3 in a schematic sectional view.

A liquid-tight connection between a connecting pipe 2 (connection) and asewer pipe 1 (concrete pipe) is shown in FIGS. 1 and 2.

According to FIG. 1 concrete pipe 1 has outer pipe surface 11 and innerpipe surface 12 which are spaced from one another by wall thickness S.Concrete pipe 1 has, like other sewer pipes too, different radii R asthe following survey shows:

    ______________________________________                                        Nominal width of                                                                           DN 300  DN400   DN500/600                                                                             DN700/1200                               concrete pipe 1 in mm                                                         Dimension R in mm                                                                          220     277     340     610                                      ______________________________________                                    

Wall thickness S, which is appropriately standardized, corresponds topipe radii R and to inside diameters D.

Branch opening 13 is placed in such a concrete pipe 1. The placing ofbranch opening 13 takes place at the location at which a branch pipe isto be provided from a site to the main sewer train line. The diameter ofbranch opening 13 is determined by the dimensions of connecting pipe 2.Special boring devices assure that branch opening 13 has an essentiallysmooth opening wall surface 14. The material of use, concrete, isdecisive for the surface and the roughness. If concrete pipe 1 isprovided with an inliner (not shown), branch opening 13 also runsthrough the latter.

Connecting pipe 2 (connection) for a connection to a sewer pipe 1according to FIG. 1 consists of connecting-pipe body 21 (see also FIGS.2, 3). Connecting-pipe body 21 can be designed as hollow- orconnecting-pipe solid body 28. It is provided on one end withcircumferential outer ring 22. Connecting-pipe body 21 and outer ring 22adjacent to it are manufactured from plastic.

Connecting-pipe body 21 comprises limiting web 29 on its inner side 21"in the end opposite outer ring 22. Seal-receiving groove 24 and,underneath it and limited by an intermediate web, another seal-receivinggroove 25 are located on its outer side 21'. Seal-receiving grooves 24,25 are designed as following wall curvatures R24 and R25 of sewer pipe 1with wall thickness S. Drainage curvature surface 23 of connecting-pipebody 28 has a wall curvature 23, running in a similar manner. If thehollow-cylindrical connecting-pipe body were cut open and unwound, itwould have a contour corresponding to the formula ##EQU3## with α from 0to 360° circumferential angle

D inside diameter of a sewer pipe

d inside diameter of a connecting pipe

for the unwinding. Seal-receiving grooves 24, 25 and flow-off curvaturesurface 23, which follows wall curvature R23, thus have a sinusoidalconfiguration.

Ring seal 5, whose sealing body is followed by sealing-lip ring 51, isplaced into seal-receiving groove 25 as a circumferential sealing ring.

A ring seal 105, whose cross section can be seen in detail in FIG. 4,can also be placed into seal-receiving groove 25 as a circumferentialsealing ring. Two sealing-lip rings 142, 143 are formed thereby onsealing body 141, which is limited by sealing-body inner surface 144 andmutually opposing outer body surfaces 145, 146. Sealing-lip ring 142 isformed like a snub turned up nose. A rounded part merges from bodylimiting surface 145 into a point which then merges in a bent fashioninto a straight piece. In contrast thereto, sealing-lip ring 143 runsfrom body limiting outer surface 146 approximately parallel to thestraight area of the sealing-lip ring likewise into a tip running upwardwhich, however, is limited by an essentially plane surface. Recess 147with a partially circular cross section is placed between sealing lip142 and sealing lip 142 in sealing body 141. Recess 147 and round part148 permit a corresponding deformation to sealing-lip rings 142, 143.The round areas assure that the inner tensional force of the material ofwhich ring seal 105 is manufactured can develop completely. Just likering seal 5, ring seal 105 is manufactured from an elastomer, especiallya rubber. The interval between the two tips of sealing-lip rings 142 and143 is proportional to the length of sealing body inner surface 144. Thelength of surface 144 is between 37 to 48 mm; correspondingly, theinterval between ring tips 142 and 143 is 8.8 to 12 mm. The width ofbody limiting- outer surface 145, 146 is approximately 5 to 8 mm.Whatever special dirmensions the parts of ring seal 105 have is afunction of the particular dimensions of connection 2. Of course, theindicated dimensions can be up to 90% below and up to 90% above them.

As FIGS. 2 and 3 show, web 27 is placed on outer surface 21' ofconnecting-pipe solid body 28. This web surrounds compatible guiderecess 35 of positioning ring 3. Positioning ring 3 is fixed on itsouter lower surface 22.2 with the aid of guide recess 35. The web canalso be placed on the positioning ring and the guide recess on body 28.The opposite, annular outer ring surface 22.1 comes to rest in aprotective manner in front of the individual parts of positioning ring3. The latter consists of ring body 31 ending in bearing flange 33. Thelatter is adapted to arced outer pipe surface 11 of concrete pipe 1.Ring body 31 comprises support webs 34 spaced on its outer side whichare connected to the bearing flange and extend to its end surface 32.This brings it about that the positioning ring can be well supported onall sides below lower surface 22.2 of the outer ring.

Connecting-pipe solid body 28 has annular, circumferential connectingring groove 26 on its inner surface 21" into which connecting-pipe ringseal 6 is placed, whose sealing body merges into a sealing-lip ring.Annular limiting web 29 which extends at least partially through isarranged at the approximate height of seal-receiving groove 24. Limitingweb 29 constitutes a ring formed on inner surface 21". For reasons ofpresentation it is reproduced somewhat curved.

The liquid-tight connection of connection 2 described in this manner toconcrete pipe 1 is performed as follows:

Positioning ring 3 is thrust with the aid of its guide recess 35 overweb 27 until below lower limiting surface 22.2 of outer ring 22. Web 27is at the most as long as the height of ring body 31. In addition, ringseal 5 and connecting ring seal 6 are placed in provided receivinggroove 25 as well as in connecting ring groove 26.

Connection 2 of the invention, which is prepared in this manner, is thenthrust like a cork into prepared branch opening 13 of concrete pipe 1.During the insertion procedure sealing-lip rings 142, 143 and 51 foldback. This is facilitated in the case of ring seal 105 by round part 148and partially circular recess 147. When sealing ring 5 is inserted theessentially triangular recess between sealing-lip ring 51 and thesealing body facilitates this. As a result of this one-sided deformationsealing-lip rings 142, 143 and 51 yield optimally to the thrustresistance. The roughness of the concrete in branch opening 13 can thusnot adversely influence lip rings 142, 143 and inserted lip ring 51. Itis important that the fixed positioning ring assures that the connectionis inserted in the proper position. As a result of the fact that itsbearing flange 33 is compatible with the outer pipe surface of theconcrete pipe the (connection can only assume an end position in theinserted state. As a result of this very essential guide functionsealing-lip rings 142 and 143 of ring seal 105 and/or the sealing-lipring 51 of ring seal 5 press against opening-wall surface 14 of branchopening 13.

The pressing of lip rings 142, 143 and 51 on rough opening-wall surface14 has the result that a high resistance is opposed to a withdrawal ofconnection 2 out of branch opening 13. The elasticity of the material,that is, of the rubber used, assures an areal contacting of thesealing-lip ring(s). As a result of the large-area contacting, lip ring51 has a sealing action on all sides relative to opening-wall surface14. Moreover, an additional clinging effect is induced.

Once connection 2 has been finally positioned, upper seal-receivinggroove 24 is filled via fill opening 41 with flexible, two-componentpolyurethane resin 4. Polyurethane resin 4 fills up slot chamber 1424extending between seal-receiving groove 24 to opening-wall surface 14 ofthe branch opening. Once enough polyurethane resin 4 has been introducedthat slot chamber 1424 is full, the filling procedure can be terminated.Pressure nubs designated by 42, 43 can form during the filling procedurewhich act to increase holding and sealing.

It is essential that a flexible, immediately thickening two-componentpolyurethane resin 4 is used which is free of solvents, externalsofteners and other volatile compounds. It therefore has the elasticproperties of air and the volume-stable properties of a cloth. Thispolyurethane resin 4 has the following technical data:

    ______________________________________                                        Reaction data:                                                                ______________________________________                                        Mixing viscosity at 15° C.                                                                Pa·s                                                                         approx. 20                                         Reaction time at 25° C.                                                                   min     8-9                                                Shore D-hardness   --      54                                                 ______________________________________                                        Substance data:                                                                                    Component A                                                                              Component B                                   ______________________________________                                        Density at 15° C.                                                                  kg/m.sup.3                                                                             990        approx. 1170                                  Flash point ° C.                                                                            140        170                                           (DIN 51758)                                                                   Viscosity   mPa·s                                                                         520 ± 100                                                                             500 ± 100                                  at 15° C.                                                              ______________________________________                                    

Component A is a mixture of different polyether polyols and additiveswhich reacts with component B to an elastic polyurethane. The mixturecan in some instances foam up when intensively mixed with water. Wateris displaced by the high viscosity in normal use without being taken upby the mixture. Component B is a prepolymer based on4,4'-diphenylmethane diisocyanate with additives.

The polyol component is to be well agitated during the processing. Thetwo components A and B are transported in a volumetric ratio of 1:1 viaa two-component pump and hoses or 2-K cartridges or coaxial cartridgesto a static mixer 5-10 mm in diameter, intimately mixed with each otherthere and discharged through fill opening 41 with a line into theinterior of the splitting chamber.

Once the filling procedure of two-component polyurethane resin 4 hasbeen concluded the fill line is drawn out of fill opening 41 and opening41 can be closed off by a closing element in the shape of a stopper orvalve. It is important that filled-in polyurethane resin 4 is pressedlike a hose seal both sealing and holding between connection 2 andbranch opening 13. In contrast to the connection only simply insertedfor the moment a withdrawal of connection 2 from branch opening 13 isnow no longer possible. In addition, polyurethane resin 4 assures that avery effective seal is established even relative to the rough concrete.The two-chamber ring seal principle used, in which a ring seal 5 and aflexible two-component polyurethane resin 4 lie over one another like ahose seal, produces a permanent seal between connecting pipe 2 and sewerpipe 1 in a simple and, in particular, effective manner.

Once connection pipe 2 has been connected to concrete pipe 1 in aliquid-tight fashion and in the manner described, the branch pipe, whichis to establish the connection between an object and concrete pipe 1serving as the main flow-off conduit, is inserted into connection 2.Circumferential limiting web 29 assures that the branch pipe is properlyinstalled. During the insertion procedure of the branch pipe intoconnection 2 connecting ring seal 6 is placed in a sealing manner aroundthe branch pipe, during which even its sealing-lip ring assumesstabilizing and sealing functions. Connecting-pipe body 21, which isdesigned as connecting-pipe solid body 28, is able, on account or itsrigidity, to take both the transport as well as the rough conditionsduring insertion into concrete pipe 1. Moreover, its smooth andcontinuous outer surface 21' assures an additional stability in branchopening 13, in which it is partially supported on opening-wall surface14. The likewise smooth and continuous inner surface 22" assures a cleanguidance and, especially, a clean hold of the branch pipe. Thiseliminates tilts of the individual parts of the liquid-tight connectionso that a branch which has once been produced with a connection inaccordance with the invention is constantly tight. This optimaltightness is established and permanently assured in a simple manner bythe two-chamber sealing principle used.

What is claimed is:
 1. A connecting pipe for a liquid-tight connectionto a sewer pipe having a branch opening, said connecting pipecomprising:a connecting-pipe body having at least two spaced apartcircumferential sealing chambers, wherein one of the sealing chamberscontains a first sealing element comprising a ring seal proximate aninside surface of the sewer pipe and facing an opening-wall surface ofthe branch opening, and wherein the ring seal comprises at least onesealing-lip ring extending over an outer contour of said one sealingchamber to contact said opening-wall surface of the branch opening, andwherein another of said sealing chambers contains a second sealingelement comprising a flexible filler proximate an outer surface of thesewer pipe and facing the opening-wall surface of the branch openingsuch that a slot chamber extending from said another sealing chamber tothe opening-wall surface of the branch opening is scalingly bridged; anda spacing ring having a bearing flange compatible with an outside pipesurface of said sewer pipe, wherein the spacing ring is a positioningring fastened to the connecting-pipe body by fastening means in such amanner that when the connecting-pipe body is inserted into the branchopening, the first and second sealing elements are positioned oppositethe opening-wall surface of the branch opening.
 2. The connecting pipeaccording to claim 1, wherein the filler is a flexible, immediatelythickening two-component polyurethane resin which is free of externalsofteners and other volatile compounds.
 3. The connecting pipe accordingto claim 1, wherein the ring seal consists of a sealing body on whichthe sealing-lip ring is formed.
 4. The connecting pipe according toclaim 3, wherein a first and a second sealing-lip ring are arranged onthe sealing body spaced apart from one another.
 5. The connecting pipeaccording to claim 4, wherein a circumferential recess partiallycircular in cross section is placed between the first and the secondsealing-lip ring.
 6. The connecting pipe according to claim 1, whereinthe sealing chambers have a contoured course corresponding to at leastone of the following formulas: ##EQU4## wherein y represents thecontoured course of the sealing chamber; α represents a circumferentialangle of 0 to 360°;D represents an inside diameter of the sewer pipe;and d represents an inside diameter of the connecting pipe.
 7. Theconnecting pipe according to claim 1, wherein the connecting-pipe bodycomprises at least one annular connecting ring groove on an innersurface of the connecting-pipe body into which ring groove aconnecting-ring seal is placed.
 8. The connecting pipe according toclaim 7, wherein the ring seal and the connecting-ring seal comprises asoft elastic material.
 9. The connecting pipe according to claim 8,wherein the soft elastic material includes rubber.
 10. The connectingpipe according to claim 1, wherein an at least partially circumferentiallimiting web is arranged on an inner surface of the connecting pipebody.
 11. The connecting pipe according to claim 1, wherein theconnecting-pipe body merges on one end into an at least partiallycircumferential outer ring under which the spacing ring is arranged, andwherein the connecting pipe further comprises fixing elements, saidfixing elements comprising the outer ring, a web placed on theconnecting-pipe body, and a guide recess introduced into the spacingring, said guide recess being compatible with the web.
 12. Theconnecting pipe according to claim 11, wherein the connecting-pipe bodyis manufactured in one piece with the circumferential outer ringcomprising a plastic material.
 13. The connecting pipe according toclaim 12, wherein the plastic material includes polyvinyl chloride. 14.The connecting pipe according to claim 1, wherein the connecting-pipebody is a solid body.
 15. The connecting pipe according to claim 1,wherein the connecting-pipe body is a double-walled body.
 16. Theconnecting pipe according to claim 1, wherein the spacing ring iscomprised of a material selected from the group consisting of a plasticmaterial, a metal material, and concrete.
 17. The connecting pipeaccording to claim 16, wherein the metal material includes asurface-finished metal.